Optical imaging lens

Abstract

An optical imaging lens, including a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element, and an eighth lens element disposed in sequence from an object side to an image side along an optical axis. The first lens element has positive refracting power, and an optical axis region of the image side of the first lens element is concave. A periphery region of the object side of the second lens element is convex. A periphery region of the image side of the third lens element is convex. An optical axis region of the image side of the fifth lens element is convex. The sixth lens element has negative refracting power. A periphery region of the object side of the eighth lens element is convex.

What is claimed is: 
     
         1 . An optical imaging lens, comprising a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element, and an eighth lens element in sequence along an optical axis from an object side to an image side, wherein the first lens element to the eighth lens element each comprise an object-side surface facing the object side and allowing imaging rays to pass through and an image-side surface facing the image side and allowing the imaging rays to pass through;
 the first lens element has positive refracting power and an optical axis region of the image-side surface of the first lens element is concave;   a periphery region of the object-side surface of the second lens element is convex;   a periphery region of the image-side surface of the third lens element is convex;   an optical axis region of the image-side surface of the fifth lens element is convex;   the sixth lens element has negative refracting power;   an optical axis region of an image-side surface of the seventh lens element is concave;   a periphery region of the object-side surface of the eighth lens element is convex;   wherein the optical imaging lens has only the eight lens elements, and the optical imaging lens satisfies the following condition:
     V 3+ V 5+ V 7≤120.000;
 
   where V3 is an Abbe number of the third lens element, V5 is an Abbe number of the fifth lens element, and V7 is an Abbe number of the seventh lens element.   
     
     
         2 . The optical imaging lens according to  claim 1 , wherein the optical imaging lens satisfies (T2+T5)/T3≥2.100, where T2 is a thickness of the second lens element on the optical axis, T3 is a thickness of the third lens element on the optical axis, and T5 is a thickness of the fifth lens element on the optical axis. 
     
     
         3 . The optical imaging lens according to  claim 1 , wherein the optical imaging lens further satisfies TL/(G67+G78)≤7.000, where TL is a distance from the object-side surface of the first lens element to the image-side surface of the eighth lens element on the optical axis, G67 is an air gap between the sixth lens element and the seventh lens element on the optical axis, and G78 is an air gap between the seventh lens element and the eighth lens element on the optical axis. 
     
     
         4 . The optical imaging lens according to  claim 1 , wherein the optical imaging lens further satisfies ImgH/(BFL+Tmax)≥2.550, where ImgH is an image height of the optical imaging lens, BFL is a distance from the image-side surface of the eighth lens element to an image plane on the optical axis, and Tmax is a maximum thickness of the eight lens elements of the first lens element to the eighth lens element on the optical axis. 
     
     
         5 . The optical imaging lens according to  claim 1 , wherein the optical imaging lens further satisfies ALT/(G56+T7)≤5.000, where ALT is a total thickness of the eight lens elements from the first lens element to the eighth lens element on the optical axis, G56 is an air gap between the fifth lens element and the sixth lens element on the optical axis, and T7 is a thickness of the seventh lens element on the optical axis. 
     
     
         6 . The optical imaging lens according to  claim 1 , wherein the optical imaging lens further satisfies AAG/(T1+T8)≤2.200, where AAG is the sum of seven air gaps from the first lens element to the eighth lens element on the optical axis, T1 is a thickness of the first lens element on the optical axis, and T8 is a thickness of the eighth lens element on the optical axis. 
     
     
         7 . The optical imaging lens according to  claim 1 , wherein the optical imaging lens further satisfies (T4+G45+T5+T8)/BFL≥2.000, where T4 is a thickness of the fourth lens element on the optical axis, T5 is a thickness of the fifth lens element on the optical axis, T8 is a thickness of the eighth lens element on the optical axis, G45 is an air gap between the fourth lens element and the fifth lens element on the optical axis, and BFL is a distance from the image-side surface of the eighth lens element to an image plane on the optical axis. 
     
     
         8 . An optical imaging lens, comprising a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element, and an eighth lens element in sequence along an optical axis from an object side to an image side, wherein the first lens element to the eighth lens element each comprise an object-side surface facing the object side and allowing imaging rays to pass through and an image-side surface facing the image side and allowing the imaging rays to pass through;
 the first lens element has positive refracting power and an optical axis region of the image-side surface of the first lens element is concave;   a periphery region of the image-side surface of the third lens element is convex;   an optical axis region of the image-side surface of the fifth lens element is convex;   the sixth lens element has negative refracting power;   a periphery region of an object-side surface of the seventh lens element is concave;   an optical axis region of an image-side surface of the seventh lens element is concave;   a periphery region of the object-side surface of the eighth lens element is convex;   wherein the optical imaging lens has only the eight lens elements, and the optical imaging lens satisfies the following condition:
     V 3 +V 5 +V 7≤120.000;
 
   where V3 is an Abbe number of the third lens element, V5 is an Abbe number of the fifth lens element, and V7 is an Abbe number of the seventh lens element.   
     
     
         9 . The optical imaging lens according to  claim 8 , wherein the optical imaging lens further satisfies (T1+T7)/T4≥2.100, where T1 is a thickness of the first lens element on the optical axis, T4 is a thickness of the fourth lens element on the optical axis, and T7 is a thickness of the seventh lens element on the optical axis. 
     
     
         10 . The optical imaging lens according to  claim 8 , wherein the optical imaging lens further satisfies TL/(G12+BFL)≥6.500, where TL is a distance from the object-side surface of the first lens element to the image-side surface of the eighth lens element on the optical axis, G12 is an air gap between the first lens element and the second lens element on the optical axis, and BFL is a distance from the image-side surface of the eighth lens element to an image plane on the optical axis. 
     
     
         11 . The optical imaging lens according to  claim 8 , wherein the optical imaging lens further satisfies (EFL+ImgH)/(Tmax+Tmin)≥8.800, where EFL is an effective focal length of the optical imaging lens, ImgH is an image height of the optical imaging lens, Tmax is a maximum thickness of the eight lens elements of the first lens element to the eighth lens element on the optical axis, and Tmin is a minimum thickness of the eight lens elements of the first lens element to the eighth lens element on the optical axis. 
     
     
         12 . The optical imaging lens according to  claim 8 , wherein the optical imaging lens further satisfies ALT/(G45+G67+G78)≤3.500, where ALT is a total thickness of the eight lens elements from the first lens element to the eighth lens element on the optical axis, G45 is an air gap between the fourth lens element and the fifth lens element on the optical axis, G67 is an air gap between the sixth lens element and the seventh lens element on the optical axis, and G78 is an air gap between the seventh lens element and the eighth lens element on the optical axis. 
     
     
         13 . The optical imaging lens according to  claim 8 , wherein the optical imaging lens further satisfies AAG/(T2+T6+T7)≤2.400, where AAG is a sum of seven air gaps from the first lens element to the eighth lens element on the optical axis, T2 is a thickness of the second lens element on the optical axis, T6 is a thickness of the sixth lens element on the optical axis, and T7 is a thickness of the seventh lens element on the optical axis. 
     
     
         14 . The optical imaging lens according to  claim 8 , wherein the optical imaging lens further satisfies TTL/(T1+G23)≤6.100, where TTL is a distance from the object-side surface of the first lens element to an image plane on the optical axis, T1 is a thickness of the first lens element on the optical axis, and G23 is an air gap between the second lens element and the third lens element on the optical axis. 
     
     
         15 . An optical imaging lens, comprising a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element, and an eighth lens element in sequence along an optical axis from an object side to an image side, wherein the first lens element to the eighth lens element each comprise an object-side surface facing the object side and allowing imaging rays to pass through and an image-side surface facing the image side and allowing the imaging rays to pass through;
 the first lens element has positive refracting power and an optical axis region of the image-side surface of the first lens element is concave;   a periphery region of the image-side surface of the third lens element is convex;   an optical axis region of the image-side surface of the fifth lens element is convex;   the sixth lens element has negative refracting power;   an optical axis region of an image-side surface of the seventh lens element is concave;   a periphery region of the object-side surface of the eighth lens element is convex, and an optical axis region of the image-side surface of the eighth lens element is concave;   wherein the optical imaging lens has only the eight lens elements, and the optical imaging lens satisfies the following condition:
     V 3+ V 5+ V 7≤120.000;
 
   where V3 is an Abbe number of the third lens element, V5 is an Abbe number of the fifth lens element, and V7 is an Abbe number of the seventh lens element.   
     
     
         16 . The optical imaging lens according to  claim 15 , wherein the optical imaging lens further satisfies (G78+T8)/(G12+T2)≥3.000, where T2 is a thickness of the second lens element on the optical axis, T8 is a thickness of the eighth lens element on the optical axis, G12 is an air gap between the first lens element and the second lens element on the optical axis, and G78 is an air gap between the seventh lens element and the eighth lens element on the optical axis. 
     
     
         17 . The optical imaging lens according to  claim 15 , wherein the optical imaging lens further satisfies TL/(G45+G56)≤12.550, where TL is a distance from the object-side surface of the first lens element to the image-side surface of the eighth lens element on the optical axis, G45 is an air gap between the fourth lens element and the fifth lens element on the optical axis, and G56 is an air gap between the fifth lens element and the sixth lens element on the optical axis. 
     
     
         18 . The optical imaging lens according to  claim 15 , wherein the optical imaging lens further satisfies (TTL+Tmin)/Tmax≤8.800, where TTL is a distance from the object-side surface of the first lens element to an image plane on the optical axis, Tmin is a minimum thickness of the eight lens elements from the first lens element to the eighth lens element on the optical axis, and Tmax is a maximum thickness of the eight lens elements of the first lens element to the eighth lens element on the optical axis. 
     
     
         19 . The optical imaging lens according to  claim 15 , wherein the optical imaging lens further satisfies BFL/(G23+G34)≤1.550, where BFL is a distance from the image-side surface of the eighth lens element to an image plane on the optical axis, G23 is an air gap between the second lens element and the third lens element on the optical axis, and G34 is an air gap between the third lens element and the fourth lens element on the optical axis. 
     
     
         20 . The optical imaging lens according to  claim 15 , wherein the optical imaging lens further satisfies EFL/(T3+T6)=7.500, where EFL is an effective focal length of the optical imaging lens, T3 is a thickness of the third lens element on the optical axis, and T6 is a thickness of the sixth lens element on the optical axis.